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Abstract

Time-resolved reflective electro-optic sampling (REOS) of ultrafast longitudinal surface fields on III-V compounds is accomplished with 50 fs optical pulses at 2 eV. Ultrafast carrier transport and screening effects of the photoexcited carriers initiate electric field transients short enough to impulsively launch longitudinal-optical phonons, in phase. A high-sensitivity measurement system allows the time-resolved investigation of the coherent phonon modes and carrier transport. In a special example the mapping of process-induced changes in the surface space charge region is demonstrated.

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